invertec-205t ac/dc. lost HF START UP!...?

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HI THERE..      .can anyone help me, as ive suddenly lost my highfrequency start up for some reason   and can only scratch start my lincoln invertec 205t ac/dc ,which is not ideal for some ally welding i need to do,but more to the piont how and why has it happened,im pulling my hair out here .....  like a dumb ***... i didnt note it down-but i was searching the net and some guy had wrote something about lincolns and having to tap/earht there torch or something to do with a polarity change and loss of high frequency???.....sorry its a bit vague,as i skipped threw what hed wrote, but i cannot find it know...lol.....but is it true and can anyone help  please
Reply:Have you tried calling lincoln???
Reply:no not tried that yet im hopeing to aviod that costly  execise...lol..lol.. and seeing if you guys could shed some light on the situation.................but i am a little dissapionted or  as im a lincoln man threw and threw and the machines not had a great deal of work,and this in my opinion shouldnt of happened! but why it did, who knows??? .........................but hopefully it can be solved on here
Reply:Do you own the manual for your unit? If not, you should be able to download it from the Lincoln site, then read it to see if it has information about adjustments, circuit breakers and such.Lincoln Electric Manuals .
Reply:Get the owners manual.Make sure you are not in stick mode. try it in AC tig and see if you have HF.IN the set up menu you can turn off the HF in DC but AC always should be working.Go into the setup menu and do a factory reset. Then start over making adjustments.If after doing this and it still does not have HF in AC or DC tig modes. You could have a problem with the HF board and or the front panel control pcb. At this point you will need a service shops help or if you ask carefully Lincoln will help.. There are very high voltages inside this welder and a mistake by you can cause you to get fried or electronic parts can explode. Large capacitors and IGBT's can go bang and throw pieces. use a face shield and other protective gear.Last edited by ccawgc; 12-20-2010 at 01:12 AM.